Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f10e416508451b…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 09:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af1572aa5dc4e9b7477c6d472df133bb SHA-1: 58dc7dd9fd6ac82785e7decddfd264915a4ce012 SHA-256: e2f10e416508451b80e8a779d0f27f34cc2f6843a1183ae6c6f93d01f09b7afe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of these links and the overall structure indicate an attempt to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=an+angle+subtended+by+an+arc+is+double+at+the+center PDF link annotation
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/51491610435.pdfIn PDF document text
    • http://teraval.cz/res/file/5822257206.pdfIn PDF document text
    • https://bem-sa.com/img/file/ranusurikilupelo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7726b9f0d---xukafuzatolafanavoseziv.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/vajudojavawanadovetaje.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/tizijebexugo.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/kuziriruluwux.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dbcc5709d---xopuludaxerinegeguziramof.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a07af250e---wozewajuxe.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160807d640880e---45048139205.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/fawebixefape.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/89944521915.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/57469637498.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/60b53efba130536691426ff91b2b4c46/nafebaganekumonowin.pdfIn PDF document text
    • http://turatabor.hu/media/95273618787.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/gaxiwumewa.pdfIn PDF document text
    • https://salwangurugram.com/files/31511347224.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/zewawotafajajeg.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/popigudaduxixizolasef.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/c386f405cb2b54115c8397756c650f60/37197049782.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/72373011869.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a223dc90194---dojaxe.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070ddccb327c---jefegoxamugik.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/fasomumumofevoramino.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/fubasol.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecd23a110---94991616920.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 19080 bytes
SHA-256: fb187d491a7e9c76262a9c240b2de2f554a49733e215aef6cff4d81603e0975e
font_01_sfnt_off000114c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD8 10984 bytes
SHA-256: 120324732e3172c697ee6b501f7be0fc29324e6011218286b30e9abfe90c972a

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